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A system extension called MODE32 enables access to installed extra memory under System 6.0.8. Under System 7.0 up to System 7.5.5 the SE/30 can use up to 128 MB of RAM. Alternatively, replacing the ROM SIMM with one from a Mac IIsi or Mac IIfx makes the SE/30 "32-bit clean" and thereby enables use of up to 128 MB RAM and System 7.5 through OS 7 ...
Only two bytes are taken by every operating system access, in contrast to four or six when using regular jump instructions. The table used to look up the appropriate function is stored in RAM. Then, even if the underlying code was stored in ROM, it could still be overridden by replacing the ROM memory address with a RAM address.
Connectix products MAXIMA, RAM Doubler, and Virtual allowed accessing and reallocating the 6 MB addresses allocated to the NuBus cards for a total of 14 MB, minus 1 MB per slot occupied. [11] [12] Because memory was a scarce resource, the authors of Classic Mac OS decided to take advantage of the unused byte in each address.
The memory management function keeps track of the status of each memory location, either allocated or free. It determines how memory is allocated among competing processes, deciding which gets memory, when they receive it, and how much they are allowed. When memory is allocated it determines which memory locations will be assigned.
The TRIM command enables an operating system to notify the SSD of pages which no longer contain valid data. For a file deletion operation, the operating system will mark the file's sectors as free for new data, then send a TRIM command to the SSD. After trimming, the SSD will not preserve any contents of the block when writing new data to a ...
Apple strengthened Mac OS X by implementing stack protection, and sandboxing more Mac OS X components such as the H.264 decoder in QuickTime and browser plug-ins as a separate process in Safari. [61] Secure virtual memory was an option in earlier releases on Snow Leopard, but the checkbox to disable it was removed later.
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System 7 (later named Mac OS 7) is the seventh major release of the classic Mac OS operating system for Macintosh computers, made by Apple Computer. It was launched on May 13, 1991, to succeed System 6 with virtual memory , personal file sharing , QuickTime , TrueType fonts, the Force Quit dialog, and an improved user interface.